/**
* jQuery history event v0.1
* Copyright (c) 2008 Tom Rodenberg <tarodenberg gmail com>
* Licensed under the GPL (http://www.gnu.org/licenses/gpl.html) license.
*/
(function($) {
	var currentHash, previousNav, timer, hashTrim = /^.*#/;

	var msie = {
		iframe: null,
		getDoc: function() {
			return msie.iframe.contentWindow.document;
		},
		getHash: function() {
			return msie.getDoc().location.hash;
		},
		setHash: function(hash) {
			var d = msie.getDoc();
			d.open();
			d.close();
			d.location.hash = hash;
		}
	};

	var historycheck = function() {
		var hash = msie.iframe ? msie.getHash() : location.hash;
		if (hash != currentHash) {
			currentHash = hash;
			if (msie.iframe) {
				location.hash = currentHash;
			}
			var current = $.history.getCurrent();
			$.event.trigger('history', [current, previousNav]);
			previousNav = current;
		}
	};

	$.history = {
		add: function(hash) {
			hash = '#' + hash.replace(hashTrim, '');
			if (currentHash != hash) {
				var previous = $.history.getCurrent();
				location.hash = currentHash = hash;
				if (msie.iframe) {
					msie.setHash(currentHash);
				}
				$.event.trigger('historyadd', [$.history.getCurrent(), previous]);
			}
			if (!timer) {
				timer = setInterval(historycheck, 100);
			}
		},
		getCurrent: function() {
			return currentHash.replace(hashTrim, '');
		}
	};

	$.fn.history = function(fn) {
		$(this).bind('history', fn);
	};

	$.fn.historyadd = function(fn) {
		$(this).bind('historyadd', fn);
	};

	$(function() {
		currentHash = location.hash;
		if ($.browser.msie) {
			msie.iframe = $('<iframe style="display:none" src="javascript:false;"></iframe>').prependTo('body')[0];
			msie.setHash(currentHash);
			currentHash = msie.getHash();
		}
	});
})(jQuery);